The present invention provides an unattended storage management method using a smartphone. The method includes an unlocking step which comprises: a smartphone unique number transmission step in which a management device control unit generates a unique number for a smartphone and transmits the number to a locking device; a lock setting step in which the management device generates a lock request message to request to set lock on the locking device, thereby controlling the storage to be closed; a courier product storage alarming step in which the management device control unit activates a smartphone communication module to transmit a unique number of the locking device to a smartphone to notify that the courier product is stored in the storage; and a locking device release request message transmission step in which the smart phone generates a release request message for the locking device including information on the unique number of the smartphone and transmits the release request message to the locking device to request opening of the storage.
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